[1] All passenger operations were switch from steam haulage to electric trains from 20 November 1958.

[1] On 1 April 1987, with the privatization and splitting of Japanese National Railways (JNR), the Hachiko Line was transferred to the ownership of JR East.

[1] From 16 March 1996, the Hachioji to Komagawa section was electrified at 1,500 V DC, and services on the non-electrified section north of Komagawa to and from Takasaki were operated separately as one-man driver only operation services using KiHa 110 series DMUs,[1][7] and the southern section began through service operations to the Kawagoe Line to Kawagoe Station.

At 07:40 on 24 August 1945, a head-on collision at the Tamagawa bridge [ja] resulted in 105 fatalities.

[9] The Hachiko Line derailment in 1947 is Japan's worst rail accident since World War II in terms of fatalities.